The 2JZGTE VVTI engine, renowned for its power and performance in the Toyota Supra, often presents a challenge when it comes to diagnostics. A common question arises: Is the 2JZGTE VVTI OBD2 compliant? The answer is a bit more complex than a simple yes or no. While the engine utilizes an OBDII connector, it doesn’t adhere to standard OBDII protocols, leading to compatibility issues with generic OBDII scanners.
Understanding the J-OBD Protocol
The 2JZGTE VVTI engine, being a Japanese Domestic Market (JDM) engine, employs a J-OBD (Japanese On-Board Diagnostics) compliant protocol. Specifically, it uses ISO 14230-4 KWP (Keyword Protocol 2000). This distinction is crucial because it means standard OBDII scanners often fail to communicate correctly with the Supra’s ECU. They are designed primarily for the more common OBDII protocols used in North American and European vehicles.
A Cost-Effective Solution for Scanning 2JZGTE VVTI
Fortunately, there’s a readily available and affordable solution for accessing diagnostic data from the 2JZGTE VVTI. This method involves using a specific combination of hardware and software:
1. ELM327 Bluetooth OBD2 Scanner: This widely available adapter acts as the interface between your smartphone or laptop and the vehicle’s OBDII port.
2. Torque Pro (Android App): Torque Pro is a powerful OBD2 diagnostic application for Android devices. Crucially, it allows for custom configuration of communication protocols.
3. Custom Initialization Commands: Within Torque Pro, under the “Vehicle Profile” settings, adding specific commands in the “VERY ADVANCED ELM327” section enables communication with the 2JZGTE VVTI ECU. These commands are:
ATIB 96 n ATIIA 13 n ATSH8213F0 n ATSP4 n 0100 Decoding the Commands:
- ATIB96: Sets the baud rate to 9600bps for communication.
- ATIIA 13: Defines the ISO initialization address.
- ATSH8213F0: Sets the header specific to the 2JZGTE VVTI protocol.
- ATSP4: Selects the ISO 14230-4 KWP (Keyword Protocol 2000) communication protocol.
- 0100: Initiates data transmission.
Important Considerations
While this method has proven successful for many Supra owners, it’s important to acknowledge that results may vary. Factors like the specific ELM327 adapter version and the Android device used can influence connectivity. Additionally, this information is based on user experiences shared within online communities and forums.
Conclusion
The 2JZGTE VVTI engine in the Toyota Supra, while equipped with an OBDII connector, utilizes the J-OBD protocol (ISO 14230-4) and is not directly compatible with standard OBDII scanners. Utilizing an ELM327 Bluetooth adapter coupled with the Torque Pro Android app and specific initialization commands provides a viable and cost-effective solution for accessing diagnostic information. This allows Supra owners to monitor engine parameters, diagnose trouble codes, and gain valuable insights into their vehicle’s performance.
